Which of the following causes a decrease in per capita consumption?
The multiplying factor, as applied to obtain the maximum daily water demand, in relation to the average i.e. per capita daily demand, is
If the average daily water consumption of a city is 24000 cum, the peak hourly demand (of the maximum day) will be
q = 24,000 cum/hr
peak hour demand= 2.7 q = 2.7 ×
The total water requirement of a city is generally assessed on the basis of
As compared to geometrical increase method of forecasting population,arithmetical increase method gives
The growth of population can be conveniently represented by a curve, which is amenable to mathematical solution. The type of this curve is
The average domestic water consumption per capita per day for an Indian city, as per IS 1172-1963, may be taken as
The total water consumption per capita per day, including domestic, commercial, and industrial demands, for an average Indian city, as per IS code, may be taken as
The population figures in a growing town are as follows :
The predicted population in 2010 by ArithmeticRegression method is
The pipe mains carrying water from the source to the reservoir are designed for the
Recommendations for designing the capacities of different components-
Sources of supply such as wells- Maximum Daily Consumption
Pipe Mains taking the water from the source upto the service reservoir-Maximum Daily Consumption
Filter and other units-Maximum Daily Draft or sometimes the twice the average daily draft
Pumps for lifting the water-Maximum Daily Draft
Distribution System- Maximum Hourly Draft of the maximum day or coincident draft
Orthotolidine test is used for determination of
In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?
In Clark’s method, total hardness is found by determining the standard soap solution required to obtain permanent lather with the water sample of known volume.
The per capita water demand include
Which one of the following methods gives the best estimate of population growth of a community with limited land area for future expansion ?
The “distribution mains” are designed for
The formula, which is most appropriate for the design of pressure pipes is
The chemical most commonly used to increase speed of sedimentation of sewage is
The valve, which allows the flow only in one direction, is a
Which of the following is known as washout valve?
Scour valve is known as washout valve. They are either located at the dead ends or at the lowest point in the mains.
Scour valves are provided
The joint used for joining the plain ends of cast iron pipes, is
Cast Iron pipes possess high strength. They are structurally stronger to withstand tensile, compressive as well as bending stresses. They can be easily acted upon by the acids present in sewer.
Types of Joints:
Bell and Spigot joints: Plain or Reinforced Concrete pipes.
Collar Joints: Concrete Pipes for larger diameter.
Simplex Joints/ Ring tie coupling: Asbestos Cement Pipes
Flexible or Bituminous Joints: Similar to collar joint but instead of cement mortar bitumen is used to make a joint
Mechanical Joint: Used for metallic sewers like Cast Iron, Steel etc. E.g. Dresser Coupling Joint
Consider the following statements :
The basic difference between water pipes and sewer pipes is
1. in the material used for the pipes
2. in the pressure of the liquid flow
3. in the suspended solids they carry
Which of these statements is/are correct ?
By using economical diameter of water mains, the benefit obtained is in terms of
High pH value of water in the pipe does not produce
PH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free hydrogen ions is acidic, whereas water that has more free hydroxyl ions is basic. Since pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically.